Calcolatrice Decibel Gratuita
Calcola il livello in decibel da potenza o intensità sonora.
W/m²
Sound Level
90.0 dB
Formula
## Decibel Scale The decibel scale expresses sound intensity on a logarithmic scale relative to a reference intensity. ### Formula **dB = 10 * log10(I / I_0)** where I_0 = 10^-12 W/m². Every 10 dB increase represents a tenfold increase in intensity. A 3 dB increase doubles the intensity.
Esempio Risolto
A sound with intensity 0.001 W/m².
- 01dB = 10 * log10(I / I_0)
- 02dB = 10 * log10(0.001 / 1e-12)
- 03dB = 10 * log10(1e9)
- 04dB = 10 * 9 = 90 dB
Domande Frequenti
Why use a logarithmic scale for sound?
Human hearing spans an enormous range of intensities (about 12 orders of magnitude). The logarithmic dB scale compresses this into a manageable 0 to 120 range.
How loud is 60 dB?
About the level of normal conversation at 1 meter distance.
What does 0 dB mean?
Zero dB is the threshold of hearing, corresponding to an intensity of 10^-12 W/m². It does not mean no sound.
Impara